Keywords: HSS-2 prototype NAN5-59.jpg The prototype of the Sikorsky YHSS-2 Sea King helicopter after 1962 SH-3A BuNo 147137 which made its first flight on 11 March 1959 090618-N-9999X-001 Navy http //www navy mil/view_image asp id 69894 U S Navy Naval Aviation News May 1959 http //www history navy mil/nan/backissues/1950s/1959/May59 pdf 1959 USN File US Navy 090618-N-9999X-001 The prototype of the Sikorsky YHSS-2 Sea King helicopter made its first flight on March 11 1959 jpg PD-USGov-Military-Navy SH-3A Sea King 1959 at Naval Air Station Patuxent River |